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Mirrors > Home > MPE Home > Th. List > 0wlkon | Structured version Visualization version GIF version |
Description: A walk of length 0 from a vertex to itself. (Contributed by Alexander van der Vekens, 2-Dec-2017.) (Revised by AV, 3-Jan-2021.) (Revised by AV, 23-Mar-2021.) (Proof shortened by AV, 30-Oct-2021.) |
Ref | Expression |
---|---|
0wlk.v | ⊢ 𝑉 = (Vtx‘𝐺) |
Ref | Expression |
---|---|
0wlkon | ⊢ ((𝑃:(0...0)⟶𝑉 ∧ (𝑃‘0) = 𝑁) → ∅(𝑁(WalksOn‘𝐺)𝑁)𝑃) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | simpl 485 | . . 3 ⊢ ((𝑃:(0...0)⟶𝑉 ∧ (𝑃‘0) = 𝑁) → 𝑃:(0...0)⟶𝑉) | |
2 | 0wlk.v | . . . . 5 ⊢ 𝑉 = (Vtx‘𝐺) | |
3 | 2 | 0wlkonlem1 27900 | . . . 4 ⊢ ((𝑃:(0...0)⟶𝑉 ∧ (𝑃‘0) = 𝑁) → (𝑁 ∈ 𝑉 ∧ 𝑁 ∈ 𝑉)) |
4 | 2 | 1vgrex 26790 | . . . . 5 ⊢ (𝑁 ∈ 𝑉 → 𝐺 ∈ V) |
5 | 4 | adantr 483 | . . . 4 ⊢ ((𝑁 ∈ 𝑉 ∧ 𝑁 ∈ 𝑉) → 𝐺 ∈ V) |
6 | 2 | 0wlk 27898 | . . . 4 ⊢ (𝐺 ∈ V → (∅(Walks‘𝐺)𝑃 ↔ 𝑃:(0...0)⟶𝑉)) |
7 | 3, 5, 6 | 3syl 18 | . . 3 ⊢ ((𝑃:(0...0)⟶𝑉 ∧ (𝑃‘0) = 𝑁) → (∅(Walks‘𝐺)𝑃 ↔ 𝑃:(0...0)⟶𝑉)) |
8 | 1, 7 | mpbird 259 | . 2 ⊢ ((𝑃:(0...0)⟶𝑉 ∧ (𝑃‘0) = 𝑁) → ∅(Walks‘𝐺)𝑃) |
9 | simpr 487 | . 2 ⊢ ((𝑃:(0...0)⟶𝑉 ∧ (𝑃‘0) = 𝑁) → (𝑃‘0) = 𝑁) | |
10 | hash0 13731 | . . . 4 ⊢ (♯‘∅) = 0 | |
11 | 10 | fveq2i 6676 | . . 3 ⊢ (𝑃‘(♯‘∅)) = (𝑃‘0) |
12 | 11, 9 | syl5eq 2871 | . 2 ⊢ ((𝑃:(0...0)⟶𝑉 ∧ (𝑃‘0) = 𝑁) → (𝑃‘(♯‘∅)) = 𝑁) |
13 | 0ex 5214 | . . . 4 ⊢ ∅ ∈ V | |
14 | 13 | a1i 11 | . . 3 ⊢ ((𝑃:(0...0)⟶𝑉 ∧ (𝑃‘0) = 𝑁) → ∅ ∈ V) |
15 | 2 | 0wlkonlem2 27901 | . . 3 ⊢ ((𝑃:(0...0)⟶𝑉 ∧ (𝑃‘0) = 𝑁) → 𝑃 ∈ (𝑉 ↑pm (0...0))) |
16 | 2 | iswlkon 27442 | . . 3 ⊢ (((𝑁 ∈ 𝑉 ∧ 𝑁 ∈ 𝑉) ∧ (∅ ∈ V ∧ 𝑃 ∈ (𝑉 ↑pm (0...0)))) → (∅(𝑁(WalksOn‘𝐺)𝑁)𝑃 ↔ (∅(Walks‘𝐺)𝑃 ∧ (𝑃‘0) = 𝑁 ∧ (𝑃‘(♯‘∅)) = 𝑁))) |
17 | 3, 14, 15, 16 | syl12anc 834 | . 2 ⊢ ((𝑃:(0...0)⟶𝑉 ∧ (𝑃‘0) = 𝑁) → (∅(𝑁(WalksOn‘𝐺)𝑁)𝑃 ↔ (∅(Walks‘𝐺)𝑃 ∧ (𝑃‘0) = 𝑁 ∧ (𝑃‘(♯‘∅)) = 𝑁))) |
18 | 8, 9, 12, 17 | mpbir3and 1338 | 1 ⊢ ((𝑃:(0...0)⟶𝑉 ∧ (𝑃‘0) = 𝑁) → ∅(𝑁(WalksOn‘𝐺)𝑁)𝑃) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 208 ∧ wa 398 ∧ w3a 1083 = wceq 1536 ∈ wcel 2113 Vcvv 3497 ∅c0 4294 class class class wbr 5069 ⟶wf 6354 ‘cfv 6358 (class class class)co 7159 ↑pm cpm 8410 0cc0 10540 ...cfz 12895 ♯chash 13693 Vtxcvtx 26784 Walkscwlks 27381 WalksOncwlkson 27382 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1969 ax-7 2014 ax-8 2115 ax-9 2123 ax-10 2144 ax-11 2160 ax-12 2176 ax-ext 2796 ax-rep 5193 ax-sep 5206 ax-nul 5213 ax-pow 5269 ax-pr 5333 ax-un 7464 ax-cnex 10596 ax-resscn 10597 ax-1cn 10598 ax-icn 10599 ax-addcl 10600 ax-addrcl 10601 ax-mulcl 10602 ax-mulrcl 10603 ax-mulcom 10604 ax-addass 10605 ax-mulass 10606 ax-distr 10607 ax-i2m1 10608 ax-1ne0 10609 ax-1rid 10610 ax-rnegex 10611 ax-rrecex 10612 ax-cnre 10613 ax-pre-lttri 10614 ax-pre-lttrn 10615 ax-pre-ltadd 10616 ax-pre-mulgt0 10617 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-ifp 1058 df-3or 1084 df-3an 1085 df-tru 1539 df-ex 1780 df-nf 1784 df-sb 2069 df-mo 2621 df-eu 2653 df-clab 2803 df-cleq 2817 df-clel 2896 df-nfc 2966 df-ne 3020 df-nel 3127 df-ral 3146 df-rex 3147 df-reu 3148 df-rab 3150 df-v 3499 df-sbc 3776 df-csb 3887 df-dif 3942 df-un 3944 df-in 3946 df-ss 3955 df-pss 3957 df-nul 4295 df-if 4471 df-pw 4544 df-sn 4571 df-pr 4573 df-tp 4575 df-op 4577 df-uni 4842 df-int 4880 df-iun 4924 df-br 5070 df-opab 5132 df-mpt 5150 df-tr 5176 df-id 5463 df-eprel 5468 df-po 5477 df-so 5478 df-fr 5517 df-we 5519 df-xp 5564 df-rel 5565 df-cnv 5566 df-co 5567 df-dm 5568 df-rn 5569 df-res 5570 df-ima 5571 df-pred 6151 df-ord 6197 df-on 6198 df-lim 6199 df-suc 6200 df-iota 6317 df-fun 6360 df-fn 6361 df-f 6362 df-f1 6363 df-fo 6364 df-f1o 6365 df-fv 6366 df-riota 7117 df-ov 7162 df-oprab 7163 df-mpo 7164 df-om 7584 df-1st 7692 df-2nd 7693 df-wrecs 7950 df-recs 8011 df-rdg 8049 df-1o 8105 df-er 8292 df-map 8411 df-pm 8412 df-en 8513 df-dom 8514 df-sdom 8515 df-fin 8516 df-card 9371 df-pnf 10680 df-mnf 10681 df-xr 10682 df-ltxr 10683 df-le 10684 df-sub 10875 df-neg 10876 df-nn 11642 df-n0 11901 df-z 11985 df-uz 12247 df-fz 12896 df-fzo 13037 df-hash 13694 df-word 13865 df-wlks 27384 df-wlkson 27385 |
This theorem is referenced by: 0wlkons1 27903 0trlon 27906 |
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